U.S. patent application number 16/441407 was filed with the patent office on 2020-01-02 for color vision correction filter and optical component.
The applicant listed for this patent is Panasonic Intellectual Property Management Co., Ltd.. Invention is credited to Tomoya IWAHASHI, Hideki WADA, Kazuyuki YAMAE.
Application Number | 20200004051 16/441407 |
Document ID | / |
Family ID | 68886248 |
Filed Date | 2020-01-02 |
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United States Patent
Application |
20200004051 |
Kind Code |
A1 |
WADA; Hideki ; et
al. |
January 2, 2020 |
COLOR VISION CORRECTION FILTER AND OPTICAL COMPONENT
Abstract
A color vision correction filter includes a least one type of
dye material and the lowest value of transmittance of the color
vision correction filter in a wavelength band ranging from 440 nm
to 600 nm, inclusive, is in the range of plus or minus 50 nm of 535
nm.
Inventors: |
WADA; Hideki; (Osaka,
JP) ; IWAHASHI; Tomoya; (Osaka, JP) ; YAMAE;
Kazuyuki; (Nara, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Panasonic Intellectual Property Management Co., Ltd. |
Osaka |
|
JP |
|
|
Family ID: |
68886248 |
Appl. No.: |
16/441407 |
Filed: |
June 14, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02C 7/108 20130101;
C09B 23/06 20130101; C09B 47/30 20130101; C09B 47/00 20130101; G02C
7/104 20130101 |
International
Class: |
G02C 7/10 20060101
G02C007/10; C09B 23/06 20060101 C09B023/06; C09B 47/00 20060101
C09B047/00; C09B 47/30 20060101 C09B047/30 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 28, 2018 |
JP |
2018-123088 |
Claims
1. A color vision correction filter, comprising: at least one type
of dye material, wherein a lowest value of transmittance of the
color vision correction filter in a wavelength band ranging from
440 nm to 600 nm, inclusive, is in a range of plus or minus 50 nm
of 535 nm.
2. The color vision correction filter according to claim 1, wherein
the lowest value of the transmittance of the color vision
correction filter in the wavelength band ranging from 440 nm to 600
nm, inclusive, is in a range of plus or minus 30 nm of 535 nm.
3. The color vision correction filter according to claim 1, wherein
a bandwidth of a peak that includes the lowest value is at least 30
nm and at most 115 nm for a predetermined value in a range in which
the transmittance of the color vision correction filter is at least
40% and at most 60%.
4. The color vision correction filter according to claim 1, wherein
a bandwidth of a peak that includes the lowest value is at least
120 nm and at most 175 nm for a predetermined value in a range in
which the transmittance of the color vision correction filter is at
least 10% and at most 30%.
5. The color vision correction filter according to claim 1, wherein
the at least one type of dye material comprises a plural types of
dye materials.
6. The color vision correction filter according to claim 1, wherein
the at least one type of dye material is a light-absorbing
material.
7. The color vision correction filter according to claim 6, wherein
the at least one type of dye material has a peak of absorption in a
range from 415 nm to 590 nm, inclusive.
8. The color vision correction filter according to claim 6, wherein
a dye material included in the at least one type of dye material
has a peak of absorption in a range from 415 nm to 425 nm,
inclusive, and a full width at half maximum of the peak is at least
20 nm and at most 45 nm.
9. The color vision correction filter according to claim 6, wherein
a dye material included in the at least one type of dye material
has a peak of absorption in a range from 490 nm to 500 nm,
inclusive, and a full width at half maximum of the peak is at least
65 nm and at most 110 nm.
10. The color vision correction filter according to claim 6,
wherein a dye material included in the at least one type of dye
material has a peak of absorption in a range from 490 nm to 505 nm,
inclusive, and a full width at half maximum of the peak is at least
70 nm and at most 105 nm.
11. The color vision correction filter according to claim 6,
wherein a dye material included in the at least one type of dye
material has a peak of absorption in a range from 520 nm to 530 nm,
inclusive, and a full width at half maximum of the peak is at least
60 nm and at most 130 nm.
12. The color vision correction filter according to claim 6,
wherein a dye material included in the at least one type of dye
material has a peak of absorption in a range from 540 nm to 550 nm,
inclusive, and a full width at half maximum of the peak is at least
70 nm and at most 125 nm.
13. The color vision correction filter according to claim 6,
wherein a dye material included in the at least one type of dye
material has a peak of absorption in a range from 570 nm to 580 nm,
inclusive, and a full width at half maximum of the peak is at least
25 nm and at most 80 nm.
14. The color vision correction filter according to claim 6,
wherein a dye material included in the at least one type of dye
material has a peak of absorption in a range from 575 nm to 585 nm,
inclusive, and a full width at half maximum of the peak is at least
25 nm and at most 100 nm.
15. The color vision correction filter according to claim 6,
wherein a dye material included in the at least one type of dye
material has a peak of absorption in a range from 580 nm to 590 nm,
inclusive, and a full width at half maximum of the peak is at least
45 nm and at most 120 nm.
16. The color vision correction filter according to claim 1,
wherein reflectance of the color vision correction filter is at
most 15%.
17. The color vision correction filter according to claim 1,
wherein the at least one type of dye material has an absorbance of
at least 90 and at most 310, and the at least one type of dye
material has a basic skeleton of merocyanine, tetraazaporphyrin, or
phthalocyanine.
18. The color vision correction filter according to claim 1,
further comprising: a base material that contains the at least one
type of dye material, wherein the base material includes a
polycarbonate-based, cycloolefin-based, or acrylic resin, a total
concentration of the at least one type of dye material contained in
the base material is at least 20 ppm and at most 850 ppm, the base
material has a thickness of at least 1 mm and at most 3 mm, and the
base material has a radius of curvature of at least 60 mm and at
most 800 mm.
19. The color vision correction filter according to claim 18,
wherein the at least one type of dye material is evenly dispersed
in the base material.
20. An optical component, comprising: the color vision correction
filter according to claim 1.
21. The optical component according to claim 20, wherein the
optical component is a pair of eyeglasses, a contact lens, an
intraocular lens, or a pair of goggles.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of priority of Japanese
Patent Application Number 2018-123088 filed on Jun. 28, 2018, the
entire content of which is hereby incorporated by reference.
BACKGROUND
1. Technical Field
[0002] The present disclosure relates to a color vision correction
filter and an optical component.
2. Description of the Related Art
[0003] Conventionally, spectacle lenses for assisting individuals
having color vision deficiency with their ability to distinguish
between colors have been known. For example, a spectacle lens for
persons with color vision deficiency, which is described in
Japanese Unexamined Patent Application Publication No. 2002-303832
(Patent Literature (PTL) 1), has a partial reflection coating on
the surface of the lens. The partial reflection coating exhibits a
spectral curve that indicates a monotonous increase or decrease of
transmittance in a wavelength range corresponding to a color that
is difficult to discern.
SUMMARY
[0004] A problem with the aforementioned conventional spectacle
lens, however, is that a surface reflectance is high.
[0005] In view of this, the present disclosure has an object to
provide a color vision correction filter and an optical component
each having a surface reflectance lower than that conventionally
attained.
[0006] In order to achieve the above object, a color vision
correction filter according to one aspect of the present disclosure
includes at least one type of dye material. The lowest value of
transmittance of the color vision correction filter in a wavelength
band ranging from 440 nm to 600 nm, inclusive, is in a range of
plus or minus 50 nm of 535 nm.
[0007] An optical component according to one aspect of the present
disclosure includes the above-described color vision correction
filter.
[0008] According to the present disclosure, it is possible to
provide a color vision correction filter and an optical component
each having a surface reflectance lower than that conventionally
attained.
BRIEF DESCRIPTION OF DRAWINGS
[0009] The figures depict one or more implementations in accordance
with the present teaching, by way of examples only, not by way of
limitations. In the figures, like reference numerals refer to the
same or similar elements.
[0010] FIG. 1 is a cross-sectional schematic view illustrating a
color vision correction filter according to an embodiment;
[0011] FIG. 2 is a graph that illustrates spectral properties of
eight types of dye materials that may possibly be contained in the
color vision correction filter according to the embodiment;
[0012] FIG. 3 is a graph that illustrates spectral properties of a
color vision correction filter according to Example 1;
[0013] FIG. 4 is a graph that illustrates spectral properties of
two types of dye materials contained in the color vision correction
filter according to Example 1;
[0014] FIG. 5 is a graph that illustrates spectral properties of a
color vision correction filter according to Example 2;
[0015] FIG. 6 is a graph that illustrates spectral properties of
four types of dye materials contained in the color vision
correction filter according to Example 2;
[0016] FIG. 7 is a graph that illustrates spectral properties of a
color vision correction filter according to Example 3;
[0017] FIG. 8 is a graph that illustrates spectral properties of
four types of dye materials contained in the color vision
correction filter according to Example 3;
[0018] FIG. 9 is a graph that illustrates spectral properties of a
color vision correction filter according to Example 4;
[0019] FIG. 10 is a graph that illustrates spectral properties of
three types of dye materials contained in the color vision
correction filter according to Example 4;
[0020] FIG. 11 is a graph that illustrates spectral properties of a
color vision correction filter according to Example 5;
[0021] FIG. 12 is a graph that illustrates spectral properties of
two types of dye materials contained in the color vision correction
filter according to Example 5;
[0022] FIG. 13 is a perspective view illustrating a pair of glasses
each including the color vision correction filter according to the
embodiment;
[0023] FIG. 14 is a perspective view illustrating a pair of contact
lenses each including the color vision correction filter according
to the embodiment;
[0024] FIG. 15 is a plan view illustrating an intraocular lens that
includes the color vision correction filter according to the
embodiment; and
[0025] FIG. 16 is a perspective view illustrating a pair of goggles
that includes the color vision correction filter according to the
embodiment.
DETAILED DESCRIPTION OF THE EMBODIMENT
[0026] The following describes in detail a color vision correction
filter and an optical component according to an embodiment of the
present disclosure. Note that the embodiment described below is one
example of the present disclosure. Accordingly, the numerical
values, shapes, materials, elements, the arrangement and connection
of the elements, steps, an order of the steps, etc. described in
the following are all mere examples, and the present disclosure is
not limited to these examples. Among elements in the following
embodiment, those not recited in any one of independent claims are
described as optional elements.
[0027] The respective drawings are schematic diagrams and are not
necessarily precise illustrations. Therefore, the scale sizes in
the drawings, for example, are not necessarily the same. In the
respective drawings, substantially identical components are
assigned the same reference signs, and overlapping description is
omitted or simplified.
Embodiment
[0028] [Color Vision Correction Filter]
[0029] First, a structure of a color vision correction filter
according to an embodiment will be described with reference to FIG.
1. FIG. 1 is a cross-sectional schematic view illustrating color
vision correction filter 1 according to the embodiment.
[0030] As illustrated in FIG. 1, color vision correction filter 1
includes base material 10 that contains one or more types of dye
materials. FIG. 1 schematically illustrates an enlarged part of a
cross section of base material 10 in a rectangular frame enclosed
by a dashed line. In the example illustrated in FIG. 1, two types
of dye materials 20 and 22 are contained in base material 10.
[0031] Base material 10 is a plate-like, light-transmissive
component. As such, in some embodiments, base material 10 includes
main surfaces separated from one another in a thickness direction.
The thickness direction of base material 10 is the direction
extending between the main surfaces of base material 10. Base
material 10 is formed by molding a transparent resin material into
a predetermined shape. Base material 10 is made, for example, of a
polycarbonate-based, cycloolefin-based, or acrylic (PMMA) resin.
Note that base material 10 may be made of a transparent glass
material.
[0032] The thickness of base material 10 is, for example, at least
1 mm and at most 3 mm. A radius of curvature of base material 10 is
at least 60 mm and at most 800 mm. Alternatively, the radius of
curvature of base material 10 may be at least 100 mm and at most
300 mm. In such a case, base material 10 may have a convex surface
and a concave surface that have different curvatures. For example,
a curvature of the convex surface may be less than that of the
concave surface. The convex and concave surfaces are, for example,
spherical, but they may not be completely spherical. For example, a
roundness of the convex and concave surfaces may be at least
several micrometers and at most a dozen micrometers in a
cross-sectional view of base material 10.
[0033] Base material 10 may have a function to collect or diffuse
light, such that realized by a convex or concave lens. The size and
shape of base material 10 match, for example, those of a spectacle
or contact lens wearable by a person.
[0034] The size and shape of base material 10, however, are not
limited to these. The thickness of base material 10 may be, for
example, less than 1 mm or greater than 3 mm. The thickness of base
material 10 may be different depending on a portion of base
material 10. In other words, base material 10 may have both a thin
portion and a thick portion. Alternatively, base material 10 may be
a flat plate whose thickness is even.
[0035] Dye materials 20 and 22 each are evenly dispersed in at
least a portion of base material 10 when seen in a plan view. For
example, dye materials 20 and 22 may be evenly dispersed throughout
the entirety of base material 10 when seen in a plan view.
Alternatively, dye materials 20 and 22 may be dispersed only in a
portion of base material 10 when seen in a plan view. For example,
dye materials 20 and 22 may only be dispersed in the center of base
material 10 when seen in a plan view. Dye materials 20 and 22 each
are also evenly dispersed over at least a portion of base material
10 in a thickness direction of base material 10. For example, dye
materials 20 and 22 may be evenly dispersed throughout the entire
thickness of base material 10 in the thickness direction. FIG. 1 is
a schematic view of color vision correction filter 1, and dye
materials 20 and 22 are dispersed in a molecular state throughout
base material 10 while being atomized to form aggregate particles.
Alternatively, dye materials 20 and 22 may be evenly dispersed only
in a portion of the thickness of base material 10 in the thickness
direction, and this portion may include one of the main surfaces of
base material 10. The main surface of base material 10 is a phase
that is orthogonal to the thickness direction of base material 10
and has the largest area, for example.
[0036] A total concentration of one or more types of dye materials
20 and 22 contained in base material 10 is, for example, at least
20 ppm and at most 850 ppm, but is not limited to such. The total
concentration may be lower than 20 ppm or higher than 850 ppm, and
may be adjusted according to the thickness of base material 10, for
example. For example, the concentration is defined to be inversely
proportional to the thickness of base material 10. When the
thickness of base material 10 is doubled to 2 mm, for example, the
concentration of each of dye materials 20 and 22 may become half of
the concentration of that dye material 20 or 22 when the thickness
of base material 10 is 1 mm,
[0037] Dye materials 20 and 22 may be light-absorbing
materials.
[0038] Specifically, dye materials 20 and 22 each absorb light
having a predetermined wavelength component. Each of dye materials
20 and 22 has an absorbance of, for example, at least 90 and at
most 310. A basic skeleton of dye material 20 or 22 is, for
example, of merocyanine expressed by general formula (1) below.
Alternatively, the basic skeleton of dye material 20 or 22 may be
of tetraazaporphyrin expressed by general formula (2) below or of
phthalocyanine expressed by general formula (3) below. By
appropriately adjusting these functional groups (e.g., at least one
of R.sub.1 through R.sub.8 in general formula (2)), for example,
desired spectral characteristics can be attained.
##STR00001##
[0039] The types of dye material 20 and dye material 22 are
mutually different. More specifically, dye materials 20 and 22 have
spectral characteristics different from each other. Dye materials
20 and 22 each are, for example, a different one selected from dye
materials C1 through C8 illustrated in FIG. 2.
[0040] In the above-described embodiment, although color vision
correction filters 1 are described as two types of dye materials 20
and 22, the number of types of dye materials contained in color
vision correction filter 1 is not limited to such. In some
examples, the color vision correction filter 1 may contain only one
type of dye material. In other examples, the color vision
correction filter 1 may contain more than two types of dye
materials (e.g., three, four, five, etc.).
[0041] FIG. 2 is a graph that illustrates spectral characteristics
of eight types of dye materials C1 through C8 that may possibly be
contained in color vision correction filter 1 according to the
present embodiment. In FIG. 2, the horizontal axis presents
wavelength (nm) and the vertical axis presents transmittance (%).
The same applies to FIG. 3 through FIG. 10 to be described
later.
[0042] In FIG. 2, transmittance per wavelength of a polycarbonate
base material (hereinafter referred to as a PC base material), in
which each of target dye materials is evenly dispersed with a
predetermined concentration, is indicated as the spectral
characteristics of the dye materials. The concentration of each dye
material to be contained is adjusted so that the lowest value of
transmittance becomes around 25%.
[0043] As illustrated in FIG. 2, dye materials C1 through C8 each
have an absorption peak in the range from 415 nm to 590 nm.
Specifically, dye materials C1 through C8 each have a peak
wavelength of the highest absorption peak, in a visible light band,
in the range from 415 nm to 590 nm. The highest absorption peak is
a peak at which transmittance becomes the lowest in the visible
light band, and a peak wavelength is a wavelength at which
transmittance becomes the lowest. The visible light band ranges
from 380 nm to 780 nm.
[0044] Dye material C1 is one example of a dye material of the
first type that has a peak of absorption in the range from 415 nm
to 425 nm, and a full width at half maximum of the peak is at least
20 nm and at most 45 nm. Specifically, dye material C1 has a peak
wavelength of the highest absorption peak, in the visible light
band, in the range from 415 nm to 590 nm.
[0045] A full width at half maximum is equivalent to a peak width
when transmittance indicates an intermediate value between the
highest value (100%) and the lowest value (specifically,
transmittance at a peak wavelength). For example, since the lowest
value of the transmittance of dye material C1 shown in FIG. 2 is
approximately 27%, a full width at half maximum is a peak width
when the transmittance is approximately 64%, that is, approximately
26 nm. The lowest value of the transmittance at a peak is
adjustable depending on the concentration of dye material C1
contained in base material 10. The same applies to dye materials C2
through C8.
[0046] Dye material C2 is one example of a dye material of the
second type that has a peak of absorption in the range from 490 nm
to 500 nm, and the full width at half maximum of the peak is at
least 65 nm and at most 110 nm. Specifically, dye material C2 has a
peak wavelength of the highest absorption peak, in the visible
light band, in the range from 490 nm to 500 nm. For example, since
the lowest value of the transmittance of dye material C2
illustrated in FIG. 2 is approximately 25%, the full width at half
maximum of a peak is a peak width when the transmittance is
approximately 63%, that is, approximately 65 nm.
[0047] Dye material C3 is one example of a dye material of the
third type that has a peak of absorption in the range from 490 nm
to 505 nm, and the full width at half maximum of the peak is at
least 70 nm and at most 105 nm. Specifically, dye material C3 has a
peak wavelength of the highest absorption peak, in the visible
light band, in the range from 490 nm to 505 nm in the visible light
band. For example, since the lowest value of the transmittance of
dye material C3 illustrated in FIG. 2 is approximately 26%, the
full width at half maximum of a peak is a peak width when the
transmittance is approximately 63%, that is, approximately 80
nm.
[0048] Dye material C4 is one example of a dye material of the
fourth type that has a peak of absorption in the range from 520 nm
to 530 nm, and the full width at half maximum of the peak is at
least 60 nm and at most 130 nm. Specifically, dye material C4 has a
peak wavelength of the highest absorption peak, in the visible
light band, in the range from 520 nm to 530 nm. For example, since
the lowest value of the transmittance of dye material C4
illustrated in FIG. 2 is approximately 27%, the full width at half
maximum of a peak is a peak width when the transmittance is
approximately 64%, that is, approximately 71 nm.
[0049] Dye material C5 is one example of a dye material of the
fifth type that has a peak of absorption in the range from 540 nm
to 550 nm, and the full width at half maximum of the peak is at
least 70 nm and at most 125 nm. Specifically, dye material C5 has a
peak wavelength of the highest absorption peak, in the visible
light band, in the range from 540 nm to 550 nm. For example, since
the lowest value of the transmittance of dye material C5
illustrated in FIG. 2 is approximately 28%, the full width at half
maximum of a peak is a peak width when the transmittance is
approximately 64%, that is, approximately 71 nm.
[0050] Dye material C6 is one example of a dye material of the
sixth type that has a peak of absorption in the range from 570 nm
to 580 nm, and the full width at half maximum of the peak is at
least 25 nm and at most 80 nm. Specifically, dye material C6 has a
peak wavelength of the highest absorption peak, in the visible
light band, in the range from 570 nm to 580 nm. For example, since
the lowest value of the transmittance of dye material C6
illustrated in FIG. 2 is approximately 24%, the full width at half
maximum of a peak is a peak width when the transmittance is
approximately 62%, that is, approximately 72 nm.
[0051] Dye material C7 is one example of a dye material of the
seventh type that has a peak of absorption in the range from 575 nm
to 585 nm, and the full width at half maximum of the peak is at
least 25 nm and at most 80 nm. Specifically, dye material C7 has a
peak wavelength of the highest absorption peak, in the visible
light band, in the range from 575 nm to 585 nm. For example, since
the lowest value of the transmittance of dye material C7
illustrated in FIG. 2 is approximately 26%, the full width at half
maximum of a peak is a peak width when the transmittance is
approximately 63%, that is, approximately 26 nm.
[0052] Dye material C8 is one example of a dye material of the
eighth type that has a peak of absorption in the range from 580 nm
to 590 nm, and the full width at half maximum of the peak is at
least 45 nm and at most 120 nm. Specifically, dye material C8 has a
peak wavelength of the highest absorption peak, in the visible
light band, in the range from 580 nm to 590 nm. For example, since
the lowest value of the transmittance of dye material C8
illustrated in FIG. 2 is approximately 29%, the full width at half
maximum of a peak is a peak width when the transmittance is
approximately 65%, that is, approximately 52 nm.
[0053] Color vision correction filter 1 illustrated in FIG. 1
contains one or more types of dye materials selected from the eight
types of dye materials C1 through C8 described above. Each of one
or more types of dye materials is contained in color vision
correction filter 1 in a predetermined proportion to a resin
material constituting base material 10.
[0054] In the present embodiment, the lowest value of the
transmittance of color vision correction filter 1 in the wavelength
band ranging from 440 nm to 600 nm is in the range of plus or minus
50 nm of 535 nm (i.e., in the range from 485 nm to 585 nm). More
specifically, the lowest value of the transmittance of color vision
correction filter 1 in the wavelength band ranging from 440 nm to
600 nm is in the range of plus or minus 30 nm of 535 nm (i.e., in
the range from 505 nm to 565 nm).
[0055] A bandwidth of a peak that includes the lowest value is at
least 30 nm and at most 115nm for a predetermined value in the
range in which the transmittance of color vision correction filter
1 is at least 40% and at most 60%. Alternatively, a bandwidth of a
peak that includes the lowest value is at least 120 nm and at most
175nm for a predetermined value in the range in which the
transmittance of color vision correction filter 1 is at least 10%
and at most 30%.
[0056] In the present embodiment, the reflectance of color vision
correction filter 1 is at most 15%. Specifically, reflectance for
the wavelength of 535 nm is at most 15%. The reflectance of color
correction filter 1 may be at most 15% in the entire visible light
band.
[0057] In the present embodiment, by containing dye materials in
base material 10, color vision correction filter 1 achieves a
desired spectrum. In other words, since a partial reflection
coating is not provided on the surface of base material 10, it is
possible to sufficiently decrease reflectance at the surface.
[0058] The following describes examples of color vision correction
filter 1. Color vision correction filter 1 according to each of the
examples is capable of correcting the color visions of individuals
having color vision deficiency. Color vision correction filters 1
according to the examples have spectral characteristics different
from one another depending on the type and severity of color vision
deficiency.
EXAMPLE 1
[0059] First, Example 1 will be described.
[0060] FIG. 3 is a graph that illustrates spectral characteristics
of a color vision correction filter according to Example 1. The
color vision correction filter according to Example 1 contains two
types of dye materials C4 and C6.
[0061] As illustrated in FIG. 3, the color vision correction filter
according to Example 1 has a peak wavelength of approximately 525
nm. Transmittance of the color vision correction filter at the peak
wavelength is approximately 15% which is the lowest value in the
wavelength band ranging from 440 nm to 600 nm. When the
transmittance is 40%, a bandwidth of a peak is approximately 55 nm.
When the transmittance is 60%, the bandwidth of the peak is
approximately 79 nm. The color vision correction filter according
to Example 1 has the peak bandwidth in the range from about 55 nm
to about 79 nm in the range in which the transmittance is at least
40% and at most 60%.
[0062] Polycarbonate was used as a resin material constituting base
material 10 of the color vision correction filter according to
Example 1. Specifically, dye material C4 and dye material C6 are
mixed with the same concentration, that is, 30 ppm. Note that the
concentration of each of the dye materials here is equivalent to a
design value when the thickness of base material 10 is defined as 1
mm. For example, the concentration is defined to be inversely
proportional to the thickness of base material 10. When the
thickness of base material 10 is doubled to 2 mm, for example, the
concentration of each of dye materials C4 and C6 becomes half, that
is, 15 ppm. In this case, transmittance is determined according to
the Lambert-Beer law.
[0063] FIG. 4 is a graph that illustrates spectral characteristics
of two types of dye materials C4 and C6 contained in the color
vision correction filter according to Example 1. FIG. 4 illustrates
transmittance per wavelength (i.e., spectral characteristics) of PC
base materials that respectively contain only a corresponding one
of the aforementioned dye materials in the same amount as that
contained in the color vision correction filter according to
Example 1. Specifically, FIG. 4 illustrates spectral
characteristics of a PC base material in which dye material C4 is
evenly dispersed with the concentration of 30 ppm, and spectral
characteristics of a PC base material in which dye material C6 is
evenly dispersed with the concentration of 30 ppm.
[0064] As illustrated in FIG. 4, with the color vision correction
filter according to Example 1, the transmittance of dye material C4
becomes the lowest at the wavelength of approximately 525 nm, and
the lowest value is approximately 28%. The full width at half
maximum of a peak that includes the lowest value is approximately
72 nm.
[0065] With the color vision correction filter according to Example
1, the transmittance of dye material C6 becomes the lowest at the
wavelength of approximately 580 nm, and the lowest value is
approximately 87%. The full width at half maximum of a peak that
includes the lowest value is approximately 48 nm.
[0066] As can be seen in the comparison between FIG. 2 and FIG. 4,
dye materials of the same type and of different concentrations have
the same peak wavelength. The lowest value at a peak varies
depending on the concentration of a dye material. In other words,
it is possible to realize desired spectral characteristics by
adjusting the types and concentrations of the dye materials to be
contained in a PC base material.
EXAMPLE 2
[0067] Next, Example 2 will be described.
[0068] FIG. 5 is a graph that illustrates spectral characteristics
of a color vision correction filter according to Example 2. The
color vision correction filter according to Example 2 contains four
types of dye materials C1, C4, C5, and C6.
[0069] As illustrated in FIG. 5, the color vision correction filter
according to Example 2 has a peak wavelength of approximately 528
nm. Transmittance of the color vision correction filter at the peak
wavelength is approximately 5% which is the lowest value in the
wavelength band ranging from 440 nm to 600 nm. When the
transmittance is 40%, a bandwidth of a peak is approximately 91 nm.
When the transmittance is 60%, the bandwidth of the peak is
approximately 115 nm. The color vision correction filter according
to Example 2 has the peak bandwidth in the range from about 91 nm
to about 115 nm in the range in which the transmittance of the
color vision correction filter is at least 40% and at most 60%.
[0070] Polycarbonate was used as a resin material constituting base
material 10 of the color vision correction filter according to
Example 2. Specifically, dye materials C1, C4, C5, and C6 are mixed
in the proportion of approximately 1:2:4:2. To be more specific,
the concentrations of dye materials C1, C4, C5, and C6 were 15 ppm,
30 ppm, 60 ppm, and 30 ppm, respectively.
[0071] FIG. 6 is a graph that illustrates spectral characteristics
of four types of dye materials C1, C4, C5, and C6 contained in the
color vision correction filter according to Example 2. FIG. 6
illustrates transmittance per wavelength (i.e., spectral
characteristics) of PC base materials that respectively contain
only a corresponding one of the aforementioned dye materials in the
same amount as that contained in the color vision correction filter
according to Example 2. Specifically, FIG. 6 illustrates: spectral
characteristics of a PC base material in which dye material C1 is
evenly dispersed with the concentration of 15 ppm; spectral
characteristics of a PC base material in which dye material C4 is
evenly dispersed with the concentration of 30 ppm; spectral
characteristics of a PC base material in which dye material C5 is
evenly dispersed with the concentration of 60 ppm; and spectral
characteristics of a PC base material in which dye material C6 is
evenly dispersed with the concentration of 30 ppm.
[0072] As illustrated in FIG. 6, with the color vision correction
filter according to Example 2, the transmittance of dye material C1
becomes the lowest at the wavelength of approximately 420 nm, and
the lowest value is approximately 17%. The full width at half
maximum of a peak that includes the lowest value is approximately
24 nm.
[0073] With the color vision correction filter according to Example
2, the transmittance of dye material C4 becomes the lowest at the
wavelength of approximately 525 nm, and the lowest value is
approximately 25%. The full width at half maximum of a peak that
includes the lowest value is approximately 70 nm.
[0074] With the color vision correction filter according to Example
2, the transmittance of dye material C5 becomes the lowest at the
wavelength of approximately 545 nm, and the lowest value is
approximately 19%. The full width at half maximum of a peak that
includes the lowest value is approximately 75 nm.
[0075] With the color vision correction filter according to Example
2, the transmittance of dye material C6 becomes the lowest at the
wavelength of approximately 575 nm, and the lowest value is
approximately 87%. The full width at half maximum of a peak that
includes the lowest value is approximately 45 nm.
EXAMPLE 3
[0076] Next, Example 3 will be described.
[0077] FIG. 7 is a graph that illustrates spectral characteristics
of a color vision correction filter according to Example 3. The
color vision correction filter according to Example 3 contains four
types of dye materials C3, C5, C6, and C7.
[0078] As illustrated in FIG. 7, the color vision correction filter
according to Example 3 has a peak wavelength in the range from 480
nm to 510 nm. Transmittance of the color vision correction filter
at the peak wavelength is approximately 1% which is the lowest
value in the wavelength band ranging from 440 nm to 600 nm. When
transmittance is 10%, a bandwidth of a peak is approximately 124
nm. When transmittance is 30%, the bandwidth of the peak is
approximately 164 nm. The color vision correction filter according
to Example 3 has the peak bandwidth in the range from about 124 nm
to about 164 nm in the range in which the transmittance is at least
10% and at most 30%.
[0079] Polycarbonate was used as a resin material constituting base
material 10 of the color vision correction filter according to
Example 3. Specifically, dye materials C3, C5, C6, and C7 are mixed
in the proportion of approximately 28:20:2:3. To be more specific,
the concentrations of dye materials C3, C5, C6, and C7 were 424
ppm, 303 ppm, 30 ppm, and 45 ppm, respectively.
[0080] FIG. 8 is a graph that illustrates spectral characteristics
of four types of dye materials C3, C5, C6, and C7 contained in the
color vision correction filter according to Example 3. FIG. 8
illustrates transmittance per wavelength (i.e., spectral
characteristics) of PC base materials that respectively contain
only a corresponding one of the aforementioned dye materials in the
same amount as that contained in the color vision correction filter
according to Example 3. Specifically, FIG. 8 illustrates: spectral
characteristics of a PC base material in which dye material C3 is
evenly dispersed with the concentration of 424 ppm; spectral
characteristics of a PC base material in which dye material C5 is
evenly dispersed with the concentration of 303 ppm; spectral
characteristics of a PC base material in which dye material C6 is
evenly dispersed with the concentration of 30 ppm; and spectral
characteristics of a PC base material in which dye material C7 is
evenly dispersed with the concentration of 45 ppm.
[0081] As illustrated in FIG. 8, with the color vision correction
filter according to Example 3, the transmittance of dye material C3
becomes the lowest at the wavelength of approximately 500 nm, and
the lowest value is approximately 3%. The full width at half
maximum of a peak that includes the lowest value is approximately
98 nm.
[0082] With the color vision correction filter according to Example
3, the transmittance of dye material C5 becomes the lowest at the
wavelength of approximately 545 nm, and the lowest value is
approximately 0%. The full width at half maximum of a peak that
includes the lowest value is approximately 112 nm.
[0083] With the color vision correction filter according to Example
3, the transmittance of dye material C6 becomes the lowest at the
wavelength of approximately 575 nm, and the lowest value is
approximately 49%. The full width at half maximum of a peak that
includes the lowest value is approximately 55 nm.
[0084] With the color vision correction filter according to Example
3, the transmittance of dye material C7 becomes the lowest at the
wavelength of approximately 580 nm, and the lowest value is
approximately 45%. The full width at half maximum of a peak that
includes the lowest value is approximately 25 nm.
EXAMPLE 4
[0085] Next, Example 4 will be described.
[0086] FIG. 9 is a graph that illustrates spectral characteristics
of a color vision correction filter according to Example 4. The
color vision correction filter according to Example 4 contains
three types of dye materials C3, C5, and C8.
[0087] As illustrated in FIG. 9, the color vision correction filter
according to Example 4 has a peak wavelength in the range from 480
nm to 510 nm. Transmittance of the color vision correction filter
at the peak wavelength is approximately 1% which is the lowest
value in the wavelength band ranging from 440 nm to 600 nm. When
transmittance is 10%, a bandwidth of a peak is approximately 108
nm. When transmittance is 30%, the bandwidth of the peak is
approximately 150 nm. The color vision correction filter according
to Example 4 has the peak bandwidth in the range from 108 nm to 150
nm in the range in which the transmittance is at least 10% and at
most 30%.
[0088] Polycarbonate was used as a resin material constituting base
material 10 of the color vision correction filter according to
Example 4. Specifically, dye materials C3, C5, and C8 are mixed in
the proportion of approximately 14:10:3. To be more specific, the
concentrations of dye materials C3, C5, and C8 were 424 ppm, 303
ppm, and 90 ppm, respectively.
[0089] FIG. 10 is a graph that illustrates spectral characteristics
of three types of dye materials C3, C5, and C8 contained in the
color vision correction filter according to Example 4. FIG. 10
illustrates transmittance per wavelength (i.e., spectral
characteristics) of PC base materials that respectively contain
only a corresponding one of the aforementioned dye materials in the
same amount as that contained in the color vision correction filter
according to Example 4. Specifically, FIG. 10 illustrates: spectral
characteristics of a PC base material in which dye material C3 is
evenly dispersed with the concentration of 424 ppm; spectral
characteristics of a PC base material in which dye material C5 is
evenly dispersed with the concentration of 303 ppm; spectral
characteristics of a PC base material in which dye material C8 is
evenly dispersed with the concentration of 90 ppm.
[0090] As illustrated in FIG. 10, with the color vision correction
filter according to Example 4, the transmittance of dye material C3
becomes the lowest at the wavelength of approximately 500 nm, and
the lowest value is approximately 5%. The full width at half
maximum of a peak that includes the lowest value is approximately
95 nm.
[0091] With the color vision correction filter according to Example
4, the transmittance of dye material C5 becomes the lowest at the
wavelength of approximately 545 nm, and the lowest value is
approximately 0%. The full width at half maximum of a peak that
includes the lowest value is approximately 112 nm.
[0092] With the color vision correction filter according to Example
4, the transmittance of dye material C8 becomes the lowest at the
wavelength of approximately 585 nm, and the lowest value is
approximately 20%. The full width at half maximum of a peak that
includes the lowest value is approximately 56 nm.
EXAMPLE 5
[0093] Next, Example 5 will be described.
[0094] FIG. 11 is a graph that illustrates spectral characteristics
of a color vision correction filter according to Example 5. The
color vision correction filter according to Example 5 contains two
types of dye materials C2 and C4.
[0095] As illustrated in FIG. 11, the color vision correction
filter according to Example 5 has a peak wavelength in the range
from 460 nm to 540 nm. Transmittance of the color vision correction
filter at the peak wavelength is approximately 0% which is the
lowest value in the wavelength band ranging from 440 nm to 600 nm.
When transmittance is 10%, a bandwidth of a peak is approximately
112 nm. When transmittance is 30%, the bandwidth of the peak is
approximately 129 nm. The color vision correction filter according
to Example 5 has the peak bandwidth in the range from about 112 nm
to about 129 nm in the range in which the transmittance is at least
10% and at most 30%.
[0096] Polycarbonate was used as a resin material constituting base
material 10 of the color vision correction filter according to
Example 5. Specifically, dye materials C2 and C4 are mixed in the
proportion of approximately 7:10. To be more specific, the
concentrations of dye materials C2 and C4 were 212 ppm and 303 ppm,
respectively.
[0097] FIG. 12 is a graph that illustrates spectral characteristics
of two types of dye materials C2 and C4 contained in the color
vision correction filter according to Example 5. FIG. 12
illustrates transmittance per wavelength (i.e., spectral
characteristics) of PC base materials that respectively contain
only a corresponding one of the aforementioned dye materials in the
same amount as that contained in the color vision correction filter
according to Example 5. Specifically, FIG. 12 illustrates: spectral
characteristics of a PC base material in which dye material C2 is
evenly dispersed with the concentration of 212 ppm; and spectral
characteristics of a PC base material in which dye material C4 is
evenly dispersed with the concentration of 303 ppm.
[0098] As illustrated in FIG. 12, with the color vision correction
filter according to Example 5, the transmittance of dye material C2
becomes the lowest at the wavelength in the range from 460 nm to
520 nm, and the lowest value is approximately 0%. The full width at
half maximum of a peak that includes the lowest value is
approximately 118 nm.
[0099] With the color vision correction filter according to Example
5, the transmittance of dye material C4 becomes the lowest at the
wavelength in the range from 470 nm to 570 nm, and the lowest value
is approximately 0%. The full width at half maximum of a peak that
includes the lowest value is approximately 134 nm.
[0100] [Optical Components]
[0101] Color vision correction filter 1 described above is used for
various optical components.
[0102] FIG. 13 through FIG. 16 each illustrate an example of an
optical component that includes color vision correction filter 1
according to the present embodiment. Specifically, FIG. 13, FIG.
14, and FIG. 16 are each a perspective view illustrating pair of
glasses 30, pair of contact lenses 32, or pair of goggles 36 as one
example of the optical component. FIG. 15 is a plan view of
intraocular lens 34 as one example of the optical component. For
example, pair of glasses 30, pair of contact lenses 32, intraocular
lens 34, and pair of goggles 36 each include at least one color
vision correction filter 1, as illustrated in each of the
drawings.
[0103] For example, pair of glasses 30 includes two color vision
correction filters 1 as right and left lenses. Contact lens 32 or
intraocular lens 34, as a whole, may be color vision correction
filter 1. Alternatively, only the center of contact lens 32 or
intraocular lens 34 may be color vision correction filter 1. Pair
of goggles 36 includes one color vision correction filter 1 as a
cover lens covering both eyes.
[0104] Note that the optical component that includes color vision
correction filter 1 is not limited to pair of glasses 30, and the
others listed above. The optical component may be, for example, a
sun visor provided inside a vehicle. In other words, the optical
component does not need to be a device wearable by a person.
[0105] [Advantageous Effects, etc.]
[0106] As has been described above, color vision correction filter
1 according to the present embodiment includes at least one type of
dye material. The lowest value of the transmittance of color vision
correction filter 1 in the wavelength band ranging from 440 nm to
600 nm may be in the range of plus or minus 50 nm of 535 nm.
[0107] This enables color vision correction filter 1 to inhibit the
transmission of a wavelength component having a center wavelength
at 535 nm (i.e., green light). The most common form of color vision
deficiency is red-green color blindness with which individuals
perceive green light stronger than red light. Since color vision
correction filter 1 is capable of inhibiting the transmission of
green light, it is possible to keep a perceptional balance between
red light and green light, and thus correct color vision
deficiency.
[0108] Color vision correction filter 1 inhibits the transmission
of green light by containing dye materials. In other words, since
it is not necessary to provide a partial reflection coating or the
like on the surface of color vision correction filter 1, which has
been a conventional case, it is possible to reduce reflectance at
the surface. According to the present embodiment, it is thus
possible to realize color vision correction filter 1 having a
surface reflectance lower than that conventionally attained.
[0109] The lowest value of the transmittance of color vision
correction filter 1 in the wavelength band ranging from 440 nm to
600 nm, inclusive, may be in the range of plus or minus 30 nm of
535 nm.
[0110] Since this makes it possible to inhibit the transmission of
green light, it is possible to keep a perceptional balance between
red light and green light, and thus correct color vision
deficiency.
[0111] A bandwidth of a peak that includes the lowest value may be
at least 30 nm and at most 115 nm for a predetermined value in the
range in which the transmittance of color vision correction filter
1 is at least 40% and at most 60%.
[0112] This makes it possible to appropriately correct color vision
deficiency according to the type and severity of color vision
deficiency.
[0113] For example, a bandwidth of a peak that includes the lowest
value may be at least 120 nm and at most 175 nm for a predetermined
value in the range in which the transmittance of color vision
correction filter 1 is at least 10% and at most 30%.
[0114] This makes it possible to appropriately correct color vision
deficiency according to the type and severity of color vision
deficiency.
[0115] At least one type of dye material may comprise a plurality
of types of dye materials. In other words, color vision correction
filter 1 may include dye materials of plural types.
[0116] This makes it possible to realize color vision correction
filter 1 having desired spectral characteristics, by appropriately
adjusting the types and concentrations of dye materials. This
therefore makes it possible to appropriately correct color vision
deficiency according to the type and severity of color vision
deficiency.
[0117] At least one type of dye material may have a peak of
absorption in the range from 415 nm to 590 nm, inclusive. A dye
material of the first type included in at least one type of dye
material may have a peak of absorption in the range from 415 nm to
425 nm, inclusive, and the full width at half maximum of the peak
may be at least 20 nm and at most 45 nm. A dye material of the
second type included in at least one type of dye material may have
a peak of absorption in the range from 490 nm to 500 nm, inclusive,
and the full width at half maximum of the peak may be at least 65
nm and at most 110 nm. A dye material of the third type included in
at least one type of dye material may have a peak of absorption in
the range from 490 nm to 505 nm, inclusive, and the full width at
half maximum of the peak may be at least 70 nm and at most 110 nm.
A dye material of the fourth type included in at least one type of
dye material may have a peak of absorption in the range from 520 nm
to 530 nm, inclusive, and the full width at half maximum of the
peak may be at least 60 nm and at most 130 nm. A dye material of
the fifth type included in at least one type of dye material may
have a peak of absorption in the range from 540 nm to 550 nm,
inclusive, and the full width at half maximum of the peak may be at
least 70 nm and at most 125 nm. A dye material of the sixth type
included in at least one type of dye material has a peak of
absorption in the range from 570 nm to 580 nm, inclusive, and the
full width at half maximum of the peak may be at least 25 nm and at
most 80 nm. A dye material of the seventh type included in at least
one type of dye material may have a peak of absorption in the range
from 575 nm to 580 nm, inclusive, and the full width at half
maximum of the peak may be at least 25 nm and at most 100 nm. A dye
material of the eighth type included in at least one type of dye
material may have a peak of absorption in the range from 580 nm to
590 nm, inclusive, and the full width at half maximum of the peak
may be at least 45 nm and at most 120 nm.
[0118] By including, in color vision correction filter 1, at least
one type of dye material selected from the dye materials of plural
types as listed above, it is possible to realize color vision
correction filter 1 capable of appropriately correcting color
vision deficiency according to the type and severity of color
vision deficiency.
[0119] At least one type of dye material may be a light-absorbing
dye material. Since this makes it possible to restrain light, whose
transmission has been inhibited, from being reflected back, it is
possible to reduce the reflectance of the color vision correction
filter.
[0120] The reflectance of color vision correction filter 1 may be
at most 15%.
[0121] This makes it possible to realize a color vision correction
filter having a sufficiently low reflectance.
[0122] At least one type of dye material may have an absorbance of
at least 90 and at most 310. At least one type of material may have
a basic skeleton of merocyanine, tetraazaporphyrin, or
phthalocyanine.
[0123] Color vision correction filter 1 may include base material
10 that contains at least one type of dye material. Base material
10 may include a polycarbonate-based, cycloolefin-based, or acrylic
resin. A total concentration of at least one type of dye material
contained in base material 10 may be at least 20 ppm and at most
850 ppm. Base material 10 may have a thickness of at least 1 mm and
at most 3mm. Base material 10 may have a radius of curvature of at
least 60 mm and at most 800 mm.
[0124] At least one type of dye material may be evenly dispersed in
base material 10.
[0125] An optical component according to present embodiment may
include color vision correction filter 1. The optical component may
be pair of glasses 30, contact lens 32, intraocular lens 34, or
pair of goggles 36.
[0126] Thus, it is possible to realize an optical component, such
as pair of glasses 30, wearable by a person. According to the
present embodiment, pair of glasses 30 that includes color vision
correction filters 1 as lenses is achieved. Supposing here the case
where a person wears a pair of glasses with a high surface
reflectance, it might be difficult to see the wearer's eyes because
the eyes are hidden behind the lenses, and this might cause some
troubles during a conversation, e.g., difficulty in reading facial
expressions. In contrast, since the surface reflectance of color
vision correction filter 1 is low, it is possible to have a
conversation with a person wearing pair of glasses 30 while looking
at the eyes of the person, and this can reduce discomfort in
everyday life.
[0127] [Others]
[0128] Although the color vision correction filter and the optical
component according to the present disclosure have been described
based on the above-described embodiment, the present disclosure is
not limited to the above-described embodiment.
[0129] For example, the eight types of dye materials C1 through C8
are illustrated in the above-described embodiment, but the dye
materials contained in color vision correction filter 1 are not
limited to these. Color vision correction filter 1 may contain dye
materials of types that are different from those of dye materials
C1 through C8.
[0130] In the above-described embodiment, although color vision
correction filters 1 each containing two to four types of dye
materials are described as Examples 1 through 4, the number of
types of dye materials contained in color vision correction filter
1 is not limited to such. Color vision correction filter 1 may
contain only one type or at least five types of dye materials.
[0131] Although the above-described embodiment has illustrated an
example such that a basic skeleton of each of the dye materials is
of merocyanine or tetraazaporphyrin, the basic skeleton is not
limited to such. Any dye materials may be used provided that they
have the above-described spectral characteristics.
[0132] Forms obtained by various modifications to the exemplary
embodiment that can be conceived by a person of skill in the art as
well as forms realized by arbitrarily combining structural
components and functions in the exemplary embodiment which are
within the scope of the essence of the present disclosure are
included in the present disclosure.
[0133] While the foregoing has described one or more embodiments
and/or other examples, it is understood that various modifications
may be made therein and that the subject matter disclosed herein
may be implemented in various forms and examples, and that they may
be applied in numerous applications, only some of which have been
described herein. It is intended by the following claims to claim
any and all modifications and variations that fall within the true
scope of the present teachings.
* * * * *